ES bool型无法使用ignore_malformed忽视格式错误

小白刚学ES。版本ES6.7

数字和字符串类型都可以使用ignore_malformed忽略格式错误，ES6.7文档说明了ignore_malformed无法应用于obiect、nested和range类型上。刚才测试bool型报错，请问大佬们是什么原因造成的。
源代码：

curl -X DELETE "localhost:9200/ignore_malformed_nested_index?pretty";



curl -X PUT "localhost:9200/ignore_malformed_nested_index?pretty" -H 'Content-Type: application/json' -d'

{

  "settings": {

    "index.mapping.ignore_malformed": true

  },

  "mappings": {

    "default_type_": {

      "properties": {

        "ismale": {

          "type": "boolean"

        }

      }

    }

  }

}

';



curl -X PUT "localhost:9200/ignore_malformed_nested_index/default_type_/1?pretty" -H 'Content-Type: application/json' -d'

{

  "ismale": 123

}

';

报错：

{

  "error" : {

    "root_cause" : [

      {

        "type" : "mapper_parsing_exception",

        "reason" : "failed to parse field [ismale] of type [boolean] in document with id '1'"

      }

    ],

    "type" : "mapper_parsing_exception",

    "reason" : "failed to parse field [ismale] of type [boolean] in document with id '1'",

    "caused_by" : {

      "type" : "json_parse_exception",

      "reason" : "Current token (VALUE_NUMBER_INT) not of boolean type\n at [Source: org.elasticsearch.common.bytes.BytesReference$MarkSupportingStreamInputWrapper@2e3bfbf5; line: 3, column: 16]"

    }

  },

  "status" : 400

}

经测试还发现，数字型或者字符串型设置ignore_malformed=true后，插ture/false，仍报相同错误，插"true"/"false"，不报错（估计当作字符串了）